I recommend [the students] that you should work actively at the Hermitage and study the artistic structures of Rubens, Rembrandt, Titian, Watteau, Poussin, and other painters, even Chardin, where he is an artist. Study very closely their dabbing manner of execution and try to copy a small piece of canvas, just one square inch.

In: a letter to his student Yudin, summer of 1924; as quoted in Marc Chagall – the Russian years 1906 – 1922, ed. By Christoph Vitali, exhibition catalogue, Schirn Kunsthalle Frankfurt, 1991, p. 66